Feanz cael bellikgee



(No'Mdel.) FL C. BELLINGER.

INTBBLOGKING THB EDGBS 0F METAL PM VBS.l No. 884,118., Patented June 5,1888.

N. Parma Phowmmmpmr, wmingnm u a UNITED STATES FRANZ GARD BELLINGER, OF

PATENT OFFICE.

FULDA, PRUSSIA, GERMANY.

INT-ERLOCKING THE EDGES OF METAL PLATES.

SPECIFICATION formingpart of Letters Patent No. 384,118, dated June 5,1888.

. Application filed July 19, 1887.

To all whom t may concern:

Be it known that I, FRANZ CARL BELLIN GER, a subject of the King ofPrussia and Em-l peror of Germany, and a resident of Fulda, Province ofHesse-Nassau, Germany, have invented new and useful ImprovementsRelating to the Joining or Uniting of Metal Plates, of which thefollowing is a` speciiication, refer ence being had to the accompanyingdrawings.

This invention relates to that class of joints for metal plates whereslots in one plate are engaged by lips on another plate and the lipssubsequently rolled down.

The object of my invention is to provide a novel construct-ion wherebythe edges of the sheetmetal plates are efficiently connected and aperfectly-,tight joint provided.

The invention consistsin the features of construction hereinaftervdescribed and claimed, reference being made to the accompanyingdrawings, in which the hgures are plan and sectional views exhibiting myinvention.

In Figure 1 the edge of the plate a contains at certain distances apartnarrow slits, the width of which is not larger than the thickness ofplate, and the length of which must be chosen according to the width ofthe joint to be made. The edge of the second plate, I), is formedwithangularincisions at the same distance apart as the slits in the firstplate, a, and the laps c thereby produced are bent up at right angles tosaid plate, as shown in Fig. 3. 'Ihese laps are then inserted in theslits of the first plate, a, Fig. 4, after which they are bent back intotheir original positions as far as possible. (See Fig. 4b.) Theprojecting laps c are now pressed into theiirst plate, a, by rollingover the seam, Fig. 4, which Serial No. 244,753. (No model.) l

is easily accomplished, because in the second plate, b, exist thecorresponding holes caused by the bentup laps c on said plate, theresult being a flat pad of the sect-ion shown in Fig. i 4, in whichthere are no longer any protrusions, and the thickness of plate iseverywhere equal to that of two single plates. The shape of the lap bentup rectangularlycan be varied at will. Fig. 5 shows trapeziform laps;Fig. 6, rectangularly twovsided laps, whichv` are bent up to the rightand left of the slit, and tit into corresponding slits in the firstplate, a. The shape of the laps can be varied according to requirement.

By forming the plate b with the angular incisions b', so that theyextend directly from edge inwardly to form the laps c, the joint can bemade tighter than heretofore.

I am aware that sheet-metal pipes have been made from a sheet of metalhaving straight slots near one edge and lips at or near the op positeedge to engage the slots; but such is notmy invention, and I do not wishto be understood as claiming the same.

What I claim is The plate b, having angular incisions b' eX- tendingdirectly from the edge of the plate intothe body thereof and then at anangle, whereby said plate is provided with angular laps c, incombination with the plate a, provided near one edge with slots toreceive said laps, substantially as shown and described.

In witness whereof I have signed the foregoing specilication this 17thday of June, 1887.

FRANZ CARL BELLIN GER.

YVitnesses:

ALvEsTo S. HOGUE, JEAN GRUND,

